Author: Johan Klockars (as28-3-8.va.g.bonet.se)
Date: 05-27-2002 09:31
> The only thing I 'have' that will take an 060 will be the CT60 when it comes.
>
> Anyone planing a through port adaptor thing so both the CT60 and Eclipse will work?
I think I should mention here that even if you manage to get some kind of through-port working, the Eclipse needs a chip with an MMU to work.
Well, you _can_ use it without an MMU, but then direct access to the screen is impossible. Besides third party software that does such things, the RageII driver itself does it when blitting areas from the screen to RAM. The driver can be forced to skip such blits, but that obviously will not always work well (many background saves (for menus etc) can be handled internally on the card, though).
It would be possible to change the driver so that it could deal with blits from the screen even without an MMU (at a speed penalty), but direct screen access will remain impossible.
(The problem is that the Eclipse PCI memory space is not completely mapped inside the 24 bit address range of the Falcon bus. It can't be, since a single PCI card could very well require more space than that. In order to allow 14 Mbyte RAM expansions to work together with the Eclipse, only a very small 'window' towards PCI memory space is available at a time (256 kbyte, IIRC, possibly even smaller) and this 'window' is moved around by setting up the MMU and dealing with bus errors.)
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